42 U.S.C. § 18387

(a) Policy reaffirmation Congress reaffirms the policy set forth in section 20102(g) of title 51 relating to surveying near-Earth asteroids and comets. (b) Implementation The Director of the OSTP shall implement, before September 30, 2012 , a policy for notifying Federal agencies and relevant emergency response institutions of an impending near-Earth object threat if near-term public safety is at risk, and assign a Federal agency or agencies to be responsible for protecting the United States and working with the international community on such threats.